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　　状语从句是句子的状语由一个从句充当，来修饰主句中的动词，形容词或副词等。状语从句都由从属连词引导，与主句连接，放在句末时，一般不在前面加逗号。

　　状语从句根据它表示的意思可分为时间，原因，条件，比较，结果，目的等类。下面我们拣重点的一个一个来分析。

　　时间状语从句：是由when, as, while, after, before, since, until, as soon as 等从属连词引导的状语从句。时间状语从句中的谓语动词不能用一般将来时，只能用一般现在时表示将来发生的动作或存在的状态。 如:I will call you as soon as I arrive there.

　　原因状语从句： because, since, as和for都表示原因。常常令我们不知该用哪个好。我们来比较一下。because语势最强，回答why提出的问题，用来说明人所不知的原因。当能够很明显的看出原因或人们已知原因，就用as或since。如：I don't like that coat,because the color looks terrible. 由because引导的从句如果放在句末，且前面有逗号，则可以用for来代替。但如果不是说明直接原因，而是多种情况加以推断，就只能用for。如：He is not here, because / for his mother is ill.

　　目的状语从句：表示目的状语的从句可以由in order that, so that,等词引导。如：You must raise your voice so that/in order that everybody can hear you clearly.

　　结果状语从句：结果状语从句常由so...that 或 such...that引导，要掌握和区分这两个句型，首先要了解so和such后面分别跟什么词。such是形容词，修饰名词或名词词组，so是副词,只能修饰形容词或副词。so 还可与表示数量的形容词many, few, much, little连用，形成固定搭配。如：The box is so heavy that I can't carry it.

　　让步状语从句：是由though, although 引导的状语从句。though, although 和 but不能同时使用。

　　Although it rained, they had a good time.

　　　　练习：

　　1. She will find him a kind man when she _________him.

　　A. knows

　　B. know

　　C. will know

　　D. is going to know

　　2. We'll go out for a walk as soon as it ________.

　　A. stops raining

　　B. raining

　　C. stop to rain

　　D. rain

　　3. The film was _____ interesting _____ everyone wanted to see it again.

　　A. too, to

　　B. so, that

　　C. not ,until

　　D. very, that

　　4. We don't understand the passage ______ there is few words in it.

　　A. and

　　B. if

　　C. though

　　D. because

　　5. You are sure to pass the exam _______ you study hard.

　　A. if

　　B. though

　　C. that

　　D. when

　　6. If you _____ free tomorrow, we won't go for a picnic.

　　A. aren't

　　B. won't be

　　C. weren't

　　D. don't

　　7. What was Jim doing _______ the teacher came in?
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